Change visibility of OrbitType parameter drivers' names to public
In OrbitType the names of the different orbital drivers are given as private static final.
I think it would be an improvement to change their visibility to public.
When dealing with another flight dynamics system where the names are different it is nice to be able to call these drivers' names in order to 'bridge' Orekit to this system.
Until now the only way to do this is to re-write/hard code the Orekit drivers' names since they are invisible outside of OrbitType.
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